.bg{background: #def}
.content-bg{margin-top: 50px;background: #fff}
.top-10{margin-top: 10px;}
.top-20{margin-top: 20px;}
.top-30{margin-top: 30px;}
.top-40{margin-top: 40px;}
.top-50{margin-top: 50px;}
.center{float: none;display: block;margin: auto;}
.text-align-center{text-align: center;}
.float-right{float: right;}
.top-0{margin-top: 0px;}
